A window, or door that has been set into a sloping roof to provide light and/or access to roof spaces and rooms within the roof area. Distinguished by protruding cheeks and often, but not always, a gabled roof.
Dormer windows are more exposed to the elements than most other windows, so it may be worth covering internal shutters with wind and draught-proofing fabric. Deep windows seats set in dormer windows can be a great feature. Window coverings, curtains and blinds, need to be flat and easy to fold back or remove, letting the maximum light in.